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      <h1 class="post-title">goroutine</h1>

      <div class="post-meta">
        <span class="post-time"> 2021-09-14 </span>
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            <a href="/categories/%E6%8A%80%E6%9C%AF/"> 技术 </a>
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          <span class="more-meta"> 约 283 字 </span>
          <span class="more-meta"> 预计阅读 1 分钟 </span>
        
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        <li><a href="#1-goroutine版回声服务器">1. goroutine版回声服务器</a></li>
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    <div class="post-content">
      <h2 id="1-goroutine版回声服务器">1. goroutine版回声服务器</h2>
<ol>
<li>服务端</li>
</ol>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<td class="lntd">
<pre class="chroma"><code class="language-go" data-lang="go"><span class="kn">package</span> <span class="nx">main</span>

<span class="kn">import</span> <span class="p">(</span>
	<span class="s">&#34;bufio&#34;</span>
	<span class="s">&#34;fmt&#34;</span>
	<span class="s">&#34;log&#34;</span>
	<span class="s">&#34;net&#34;</span>
	<span class="s">&#34;strings&#34;</span>
	<span class="s">&#34;time&#34;</span>
<span class="p">)</span>

<span class="c1">// goroutine版回声服务器
</span><span class="c1"></span><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
	<span class="nx">listener</span><span class="p">,</span> <span class="nx">err</span> <span class="o">:=</span> <span class="nx">net</span><span class="p">.</span><span class="nf">Listen</span><span class="p">(</span><span class="s">&#34;tcp&#34;</span><span class="p">,</span> <span class="s">&#34;localhost:8880&#34;</span><span class="p">)</span>
	<span class="k">if</span> <span class="nx">err</span> <span class="o">!=</span> <span class="kc">nil</span> <span class="p">{</span>
		<span class="nx">log</span><span class="p">.</span><span class="nf">Fatal</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span>
	<span class="p">}</span>

	<span class="k">for</span> <span class="p">{</span>
		<span class="nx">conn</span><span class="p">,</span> <span class="nx">err</span> <span class="o">:=</span> <span class="nx">listener</span><span class="p">.</span><span class="nf">Accept</span><span class="p">()</span>
		<span class="k">if</span> <span class="nx">err</span> <span class="o">!=</span> <span class="kc">nil</span> <span class="p">{</span>
			<span class="c1">// 例如，连接中断会发生错误
</span><span class="c1"></span>			<span class="nx">log</span><span class="p">.</span><span class="nf">Print</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span>
			<span class="k">continue</span>
		<span class="p">}</span>
		<span class="c1">// 一次处理一个
</span><span class="c1"></span>		<span class="k">go</span> <span class="nf">handleConn</span><span class="p">(</span><span class="nx">conn</span><span class="p">)</span>
	<span class="p">}</span>
<span class="p">}</span>

<span class="c1">// 处理
</span><span class="c1"></span><span class="kd">func</span> <span class="nf">handleConn</span><span class="p">(</span><span class="nx">conn</span> <span class="nx">net</span><span class="p">.</span><span class="nx">Conn</span><span class="p">)</span> <span class="p">{</span>
	<span class="k">defer</span> <span class="nx">conn</span><span class="p">.</span><span class="nf">Close</span><span class="p">()</span>
	<span class="nx">input</span> <span class="o">:=</span> <span class="nx">bufio</span><span class="p">.</span><span class="nf">NewScanner</span><span class="p">(</span><span class="nx">conn</span><span class="p">)</span>
	<span class="k">for</span> <span class="nx">input</span><span class="p">.</span><span class="nf">Scan</span><span class="p">()</span> <span class="p">{</span>
		<span class="k">go</span> <span class="nf">echo</span><span class="p">(</span><span class="nx">conn</span><span class="p">,</span> <span class="nx">input</span><span class="p">.</span><span class="nf">Text</span><span class="p">(),</span> <span class="mi">1</span> <span class="o">*</span> <span class="nx">time</span><span class="p">.</span><span class="nx">Second</span><span class="p">)</span>
	<span class="p">}</span>
<span class="p">}</span>

<span class="c1">// 回声器
</span><span class="c1"></span><span class="kd">func</span> <span class="nf">echo</span><span class="p">(</span><span class="nx">c</span> <span class="nx">net</span><span class="p">.</span><span class="nx">Conn</span><span class="p">,</span> <span class="nx">shout</span> <span class="kt">string</span><span class="p">,</span> <span class="nx">delay</span> <span class="nx">time</span><span class="p">.</span><span class="nx">Duration</span><span class="p">)</span> <span class="p">{</span>
	<span class="nx">fmt</span><span class="p">.</span><span class="nf">Fprintln</span><span class="p">(</span><span class="nx">c</span><span class="p">,</span> <span class="s">&#34;\t&#34;</span><span class="p">,</span> <span class="nx">strings</span><span class="p">.</span><span class="nf">ToUpper</span><span class="p">(</span><span class="nx">shout</span><span class="p">))</span>
	<span class="nx">time</span><span class="p">.</span><span class="nf">Sleep</span><span class="p">(</span><span class="nx">delay</span><span class="p">)</span>
	<span class="nx">fmt</span><span class="p">.</span><span class="nf">Fprintln</span><span class="p">(</span><span class="nx">c</span><span class="p">,</span> <span class="s">&#34;\t&#34;</span><span class="p">,</span> <span class="nx">shout</span><span class="p">)</span>
	<span class="nx">time</span><span class="p">.</span><span class="nf">Sleep</span><span class="p">(</span><span class="nx">delay</span><span class="p">)</span>
	<span class="nx">fmt</span><span class="p">.</span><span class="nf">Fprintln</span><span class="p">(</span><span class="nx">c</span><span class="p">,</span> <span class="s">&#34;\t&#34;</span><span class="p">,</span> <span class="nx">strings</span><span class="p">.</span><span class="nf">ToLower</span><span class="p">(</span><span class="nx">shout</span><span class="p">))</span>
<span class="p">}</span>
</code></pre></td></tr></table>
</div>
</div><ol start="2">
<li>客户端</li>
</ol>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<td class="lntd">
<pre class="chroma"><code class="language-go" data-lang="go"><span class="kn">package</span> <span class="nx">main</span>

<span class="kn">import</span> <span class="p">(</span>
	<span class="s">&#34;io&#34;</span>
	<span class="s">&#34;log&#34;</span>
	<span class="s">&#34;net&#34;</span>
	<span class="s">&#34;os&#34;</span>
<span class="p">)</span>
<span class="c1">// 只读的tcp客户端程序
</span><span class="c1"></span><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
	<span class="nx">conn</span><span class="p">,</span> <span class="nx">err</span> <span class="o">:=</span> <span class="nx">net</span><span class="p">.</span><span class="nf">Dial</span><span class="p">(</span><span class="s">&#34;tcp&#34;</span><span class="p">,</span> <span class="s">&#34;localhost:8880&#34;</span><span class="p">)</span>
	<span class="k">if</span> <span class="nx">err</span> <span class="o">!=</span> <span class="kc">nil</span> <span class="p">{</span>
		<span class="nx">log</span><span class="p">.</span><span class="nf">Fatal</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span>
	<span class="p">}</span>
	<span class="k">defer</span> <span class="nx">conn</span><span class="p">.</span><span class="nf">Close</span><span class="p">()</span>
	<span class="k">go</span> <span class="nf">mustCopy</span><span class="p">(</span><span class="nx">os</span><span class="p">.</span><span class="nx">Stdout</span><span class="p">,</span> <span class="nx">conn</span><span class="p">)</span>
	<span class="nf">mustCopy</span><span class="p">(</span><span class="nx">conn</span><span class="p">,</span> <span class="nx">os</span><span class="p">.</span><span class="nx">Stdin</span><span class="p">)</span>
<span class="p">}</span>

<span class="kd">func</span> <span class="nf">mustCopy</span><span class="p">(</span><span class="nx">dst</span> <span class="nx">io</span><span class="p">.</span><span class="nx">Writer</span><span class="p">,</span> <span class="nx">src</span> <span class="nx">io</span><span class="p">.</span><span class="nx">Reader</span><span class="p">)</span> <span class="p">{</span>
	<span class="k">if</span> <span class="nx">_</span><span class="p">,</span> <span class="nx">err</span> <span class="o">:=</span> <span class="nx">io</span><span class="p">.</span><span class="nf">Copy</span><span class="p">(</span><span class="nx">dst</span><span class="p">,</span> <span class="nx">src</span><span class="p">);</span> <span class="nx">err</span> <span class="o">!=</span> <span class="kc">nil</span> <span class="p">{</span>
		<span class="nx">log</span><span class="p">.</span><span class="nf">Fatal</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span>
	<span class="p">}</span>
<span class="p">}</span>
</code></pre></td></tr></table>
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